32nd International Symposium on Lattice Field Theory (Lattice 2014)

Kaon and D meson semileptonic form factors from lattice QCD

24 Jun 2014, 18:10

2h

Low library

Board: 4

Poster Weak Decays and Matrix Elements Poster session

Speaker

Dr Thomas Primer (University of Arizona)

Description

We present calculations of the $K\to \pi ,l\nu$ and $D\to \pi ,l\nu$ semileptonic form factors at $q^2=0$. These form factors are important for the determination of the CKM matrix elements $|V_{us}|$ and $|V_{cd}|$ respectively. This work uses the HISQ action for both valence quarks and sea quarks on MILC $N_f=2+1+1$ configurations. We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly. The $K\to \pi$ results are an update to previously published results with new data at the physical quark mass. The $D\to \pi$ results are preliminary, working at the physical light quark mass at three different lattice spacings down to 0.06 fm.